{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The known compounds were identified as 3 beta - hydroxytaraxer - 14 - en - 28 - oic acid or aleuritolic acid ( 5 ) ( McPhail , A . T . , McPhail , D . R . , Wani , M . C . , Wall , M . E . & A . W . , Nicholas , A . W . ( 1989 ) . Identity of maprounic acid with aleuritolic acid . Revision of the structure of maprounic acid : X - ray crystal structure of p - bromobenzyl acetylmaprounate . Journal Natural Products , 52 , 212 ) , 3 alpha - hydroxytaraxer - 14 - en - 28 - oic acid or isoaleuritolic acid ( 6 ) , 3 alpha - acetyltaraxer - 14 - en - 28 - oic acid acetate or aleuritolic acid acetate ( 7 ) ( Chaudhuri , S . K . , Fullas , F . , Brown , D . M . , Wani , M . C . , Wall , M . E . , Cai , L . , ... Kinghorn , A . D . ( 1995 ) . Isolation and structural elucidation of pentacyclic triterpenoids from Maprounea africana . Journal of Natural Products , 58 , 1 - 9 ) , 3 - oxo - taraxer - 14 - ene or taraxerone ( 8 ) beta - sitosterol ( 9 ) and stigmasterol ( 10 ) ( Kamboj & Saluja , 2011 ) , together with fatty acids ."}
{"Chemical": ["3 beta - hydroxytaraxer - 14 - en - 28 - oic acid", "aleuritolic acid", "maprounic acid", "p - bromobenzyl acetylmaprounate", "3 alpha - hydroxytaraxer - 14 - en - 28 - oic acid", "isoaleuritolic acid", "3 alpha - acetyltaraxer - 14 - en - 28 - oic acid acetate", "aleuritolic acid acetate", "3 - oxo - taraxer - 14 - ene", "taraxerone", "beta - sitosterol", "stigmasterol"]}